<!DOCTYPE html>
<html>
<head>
    <meta charset="UTF-8">
    <link rel="stylesheet" href="https://cdnjs.cloudflare.com/ajax/libs/font-awesome/6.0.0-beta3/css/all.min.css">

    <style>
        /* 样式用于布局，可根据需要进行调整 */
        body, html {
            height: 100%;
            margin: 0;
            font-family: Arial, sans-serif;
        }
        #menu {
            background-color: #333;
            height: 100%;
            width: 20%;
            float: left;
            box-sizing: border-box;
            color: #fff;
        }
        #content {
            height: 100%;
            width: 80%;
            float: left;
            padding: 20px;
            box-sizing: border-box;
            background-color: #f9f9f9;
        }
        /* 以下样式用于美化菜单 */
        .menu-item {
            padding: 15px 20px;
            cursor: pointer;
            border-bottom: 1px solid #444;
            transition: background-color 0.3s ease;
        }
        .menu-item:hover {
            background-color: #444;
        }
        /* 样式用于撑满整个右侧区域 */
        #pageFrame {
            width: 100%;
            height: 100%;
            border: none;
        }
        /* 样式用于全屏按钮 */
        #fullscreenButton {
            position: absolute;
            bottom: 10px;
            right: 10px;
            padding: 10px;
            cursor: pointer;
        }
    </style>
</head>
<body>
<div id="menu">
    <div class="menu-item" onclick="loadPage('task-list.html')">任务列表</div>
    <div class="menu-item" onclick="loadPage('model-list.html')">流程列表</div>
    <div class="menu-item" onclick="loadPage('page3.html')">首页</div>
</div>
<div id="content">
    <iframe id="pageFrame" src="" frameborder="0"></iframe>
    <div id="fullscreenButton" onclick="toggleFullScreen()">
        <i class="fas fa-expand-arrows-alt"></i> <!-- Font Awesome图标 -->
    </div>
</div>

<script>
    function loadPage(pageURL) {
        const pageFrame = document.getElementById('pageFrame');
        pageFrame.src = pageURL;
    }

    function toggleFullScreen() {
        const content = document.getElementById('content');

        if (!document.fullscreenElement) {
            content.requestFullscreen().catch(err => {
                alert(`Error attempting to enable full-screen mode: ${err.message} (${err.name})`);
            });
        } else {
            document.exitFullscreen();
        }
    }
</script>
</body>
</html>
